PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/21-20:27:50
G10     291.1          49.1               14.2 +/-    1.16      18.0 +/-    1.16  0.060 / 0.100
G15     46.8           31.2               13.8 +/-    0.59      23.5 +/-    0.59  0.050 / 0.080
G18     351.1          66.6               13.3 +/-    0.65      14.3 +/-    0.65  0.040 / 0.040
G20     68.5           21.1               14.1 +/-    3.53      30.2 +/-    3.53  0.040 / 0.050
G21     89.4           73.9               15.3 +/-    0.87      15.8 +/-    0.87  0.060 / 0.160
G24     103.1          24.9               16.5 +/-    1.01      32.3 +/-    1.01  0.060 / 0.120
G27     303.0          33.4               15.2 +/-    1.70      24.9 +/-    1.70  0.080 / 0.230
G32     209.9          25.6               17.5 +/-    1.99      33.7 +/-    1.99  0.090 / 0.260